Means for sharpening the fly cutters of cigarette-rod machines



M. P. E. HOHN ,746,257

MEANS FOR SHARPENING THE FLY.CUTTERS OF CIGARETTE ROD MACHINES Feb. 11, 1930.

Filed Feb. 2, 1929 2 Sheets-Sheet 1 @kwwmzm Feb. 11, 1930.

M. P. E. HOHN 1,746,257

MEANS FOR SHARPENING THE FLY CUTTERS OF CIGARETTE ROD MACHINES Patented Feb. 11, 1930 stream PATENT orrrce MAX PAUL ERNST HOHN, F DRESDEN, GERMANY, ASSIG-NOR- TO THE FIRM UNI- VERSELLE CIG-ARETTENMASGHINEN-FABRIK, J. C. MULLER & (10., OF DRESDEN,

GERMANY MEANS FOR SHARPENING THE FLY CUTTERS OF CIGARETTE-ROD MACHINES Application filed February 2, less, Serial No.

This invention relates to improvements in grinding means for the fly cutters of cigarette rod machines.

In grinding the edge of the fly-cutter burrs are formed which must be removed by a stropping or setting means operating on the rear or" the grinding edge of the fly-cutter.

The invention is directed to connecting such stropping or setting means with the grinding means moved in a circular path in such manner that after the cutting edge passes the grinding means, a setting means also moving in a circular path becomes operative to remove the burrs.

In accordance with the invention the grinding means and the stropping or setting means are moved about the same axis in a circular path but each on a separate and separately driven support in such manner that the cutting edge of the flycutter after passing the grinding means comes into contact with the setting means disposed at a convenient axial distance from the grinding means. By separately driving the grinding and the setting means complete adjustment in relation to the passage of the cutting edge 'is obtainable. Thus two, four or more grinding devices and as many setting devices may be provided, the grinding devices and setting or stropping devices each being carried by a star-shaped or disc-shaped support. Each support is arranged on a hollow rotatable spindle. The hollow spindles fit one within the other and are arranged on a stationary spindle or rod. Motion is transmitted through toothed or worm gearing.

In order to be able to compensate for the wear of the cutting edge of the fly-cutter the rotating spindle is mounted with its driving gearing in a housing which may be displaced and secured in adjusted position as a whole in such manner that the direction of displacement is substantially parallel to the plane in which the fly-cutter rotates.

The invention will be explained more fully by the aid of the accompanying drawings in which Fig. 1 is a side view partly in vertical longitudinal section and Fig. 2 a plan view partly in horizontal cross section.

In the embodiment shown four grinding 337,092, and in Germany February 10, 1928.

the cutting operation to follow the feeding movement of the rod.

011 the machine frame 4 a housing 5 is arranged in such manner that it can be displaced at right angles or approximately right angles to the shaft 3. For this purpose the housing is formed with a perforated lug or boss 6 in which is mounted a spindle 7 This spindle has a handle 8 rigidly connected thereto and is screwed into the screw-threaded opening 9 on a bracket arm 10 mounted on the machine frame. The lug 6 is held between a collar 11 and an adjustable collar 12 in such manner that on rotation of the handle 8 the housing 5 can be displaced in either direction as indicated by the double arrow in By means of this arrangement the grinding and setting means will be adjusted as the fly-cutter wears.

In the housing 5 the spindle 13 is securely mountet. On this spindle 13 are disposed concentrically one within another two sleeves 14, 15. A rotating cross 16 which carries the grinding discs 17 is secured to the outer sleeve 15 while the plate 18 on which the setting discs 19 are mounted is secured to the inner sleeve 14. The sleeve 15 is prevented from moving axially by means of the adjustable collar 20. On the arms of the rotating cross 21 sleeves 22 are mounted in such manner that they may be moved and secured in any adjusted position. The sleeves 22 carry downw rdly extending cylindrical extensions or rods 23 on which members 2 1 may be rotated, adjusted and may be secured. These members 24: are formed at one side as journals 25 on which the spindles 26 of the grinding discs 17 rotate. The grinding discs 17 are thus displaceable not only radially of the axis of the cross 16 but also are movable universally in space. In this manner the grinding device can be so exactly adjusted that the fly-cutter comes into contact with the grinding disc as it passes.

he setting or stropping discs 19 have a rounded surface and are universally adjustable with respect to the plate 18 by means of the members 27 and 28, the spindles 29 rotatm ingrfreely in bearings in the members 28.

he apparatus is driven by the shaft 30, a worm 31 being keyed thereto so that it may be moved axially but cannot be rotated. The worm is held between the bushings 33 and 34 secured to the housing 5 in such manner that it takes part in the displacement of the housing 5 in either direction of the double arrow of Fig. 2. The worm 31 drives a worm wheel 35 which engages with a pinion 36 on the sleeve 15 so that the rotating cross 16 with the grinding discs 17 is set in rotation. With the worm wheel 35 is rigidly connected a pinion 37 which meshes with the pinion 38 on the sleeve 14 and thus sets the plate 18 with its setting discs 19 in rotation.

I claim:

1. Means for sharpening the fly-cutters of cigarette rod machines comprising grinding means, a rotatable support for said grinding means, and means for rotating said support, a. setting means, a rotatable support for said setting means, said last-mentioned rotatable support coaxial with said first-mentioned rotatable support, and driving means one for drivin each of said rotatable supports.

2. lifeans for sharpening the fiy-cutters of cigarette rod machines comprising a plurality of grinding devices, a rotatable support for said grinding devices, and means for rotating said sup ort, a plurality of setting means, a rotata le support for said setting means, said rotatable support being constituted by coaxial sleeves fitting one within the other, driving means one for driving each of said sleeves and a housing carrying said driving means, said housing adjustable parallel' to the direction of rotation of the said flycutter.

In testimony whereof I aflix my signature. MAX PAUL ERNST HOHN. 

